"use client";

/**
 * Workflow v3 edge: LLM judgement, variable expression, or deterministic default.
 */

import {
  BaseEdge,
  EdgeLabelRenderer,
  getBezierPath,
  type EdgeProps,
  useReactFlow,
} from "@xyflow/react";
import { Pencil, Trash2 } from "lucide-react";
import { useContext, useState } from "react";

import { cn } from "@/lib/utils";
import { EdgeActionContext } from "./context";

export function ConditionEdge({
  id,
  sourceX,
  sourceY,
  targetX,
  targetY,
  sourcePosition,
  targetPosition,
  data,
  selected,
}: EdgeProps) {
  const actions = useContext(EdgeActionContext);
  const { setEdges } = useReactFlow();
  const [hovered, setHovered] = useState(false);

  // 点击标签:只选中这条边(露出编辑/删除按钮),不直接进入编辑。
  const selectThisEdge = () =>
    setEdges((eds) => eds.map((e) => ({ ...e, selected: e.id === id })));
  const [path, labelX, labelY] = getBezierPath({
    sourceX,
    sourceY,
    sourcePosition,
    targetX,
    targetY,
    targetPosition,
    curvature: 0.28,
  });

  const mode = (data?.mode as string) || "always";
  const label = (
    (data?.label as string) ||
    (mode === "llm" ? (data?.condition as string) : "") ||
    (mode === "llm"
      ? "大模型判断"
      : mode === "expression"
        ? "表达式"
        : "默认路径")
  ).toString().trim();
  const expanded = hovered || selected;

  return (
    <>
      <BaseEdge
        id={id}
        path={path}
        style={{
          stroke: selected ? "var(--primary)" : "var(--muted-soft)",
          strokeWidth: selected ? 2.5 : 1.5,
          transition: "stroke 0.15s ease, stroke-width 0.15s ease",
        }}
      />
      <EdgeLabelRenderer>
        <div
          className="nodrag nopan pointer-events-auto absolute flex items-center gap-1"
          style={{
            transform: `translate(-50%, -50%) translate(${labelX}px, ${labelY}px)`,
          }}
          onMouseEnter={() => setHovered(true)}
          onMouseLeave={() => setHovered(false)}
        >
          <button
            type="button"
            title="条件"
            className={cn(
              "max-w-[160px] truncate rounded-full border px-2.5 py-1 text-xs shadow-sm transition-colors",
              label
                ? "border-hairline bg-card text-foreground hover:border-primary"
                : "border-dashed border-hairline-strong bg-card/80 text-muted-soft hover:text-foreground",
              selected && "border-primary ring-2 ring-primary/30",
            )}
            onClick={selectThisEdge}
          >
            {label || "＋ 条件"}
          </button>

          {expanded && (
            <button
              type="button"
              title="编辑条件"
              className="flex h-6 w-6 items-center justify-center rounded-full border border-hairline bg-card text-muted-foreground shadow-sm transition-colors hover:text-foreground"
              onClick={() => actions.edit(id)}
            >
              <Pencil size={12} />
            </button>
          )}
          {expanded && (
            <button
              type="button"
              title="删除连线"
              className="flex h-6 w-6 items-center justify-center rounded-full border border-hairline bg-card text-muted-foreground shadow-sm transition-colors hover:text-destructive"
              onClick={() => actions.remove(id)}
            >
              <Trash2 size={12} />
            </button>
          )}
        </div>
      </EdgeLabelRenderer>
    </>
  );
}

export const edgeTypes = { condition: ConditionEdge };